Pero esto no es nuevo. Ya el pasado año WSJ decía:“The major new players in e-book publishing—Amazon, Apple and Google—can easily track how far readers are getting in books, how long they spend reading them and which search terms they use to find books. Book apps for tablets like the iPad, Kindle Fire and Nook record how many times readers open the app and how much time they spend reading. Retailers and some publishers are beginning to sift through the data, gaining unprecedented insight into how people engage with books.”

“Some privacy watchdogs argue that e-book users should be protected from having their digital reading habits recorded. “There’s a societal ideal that what you read is nobody else’s business,” says Cindy Cohn, legal director for the Electronic Frontier Foundation, a nonprofit group that advocates for consumer rights and privacy. “Right now, there’s no way for you to tell Amazon, I want to buy your books, but I don’t want you to track what I’m reading.”